Electric bell



UNITED l STATES PATENT OFFICE. i,

, FRANK B. WOOD, CE NEw YORK, N. Y., AssiCNoE To THE NEW HAVEN CLOCK COMPANY, OE NEW HAVEN, CONNECTICUT.

ELECTRIC BELL'.

SPECIFICATION forming partof Letters Patent No. 381,314, dated April 1,'7, 1888.

' Application led April 29, i886. Serial No.'200,530. (No model.)

To aZ'Z whom it may concern.' f

Beit known that I, FRANK B. Woon, residing at New York, in the county`of New York and State of New York, have invented certain new and useful Improvements in Electric Bells;

v and I do declare the following to be a full,

vIO

scribed, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in perspective showing my improved instrument converted for vibratory action and with the bell removed. Fig. 2 is aview thereof in side elevation, showing the `mechanism in:

the same adj ustment and with the bell in place; and Fig. 3 isa rear elevation of the -cut-out devices.

A horizontal shaft, A, provided with an eccentric or cam, B, and with a notched disk, C, forv turning it, is mounted so as to turn freely in a sleeve, X, of hard rubber or equivalent insulating material, such sleeve being mounted in au arm, E D, located in the center of and extending above the yoke F of the frame ofthe instrument. The said insulated shaft is situated directly above and parallel with a bar, G,'carrying upon its inner end the armature H, and providedat its outer end with the bell-hammer I, and secured to and midway the length of au arbor, J, mounted in adjustable centers K K, located in the arms L L of the yoke aforesaid. A light contactf spring, M, formed of a strip of thin metal, is

secured to the upper face of the said bar G and extends rearwardly under the eccentric or cam, with which it engages. rIhe frame of the instrument is made in one piece, and consists of the yoke F, with its arms L L, an upright, 0, and afoot, P, the latter having secured to it thecross-piece Q, supporting the coils R B of the magnet. An angle-plate, S, also. se-

cured to the foot P of the frame, carriesthe spindle T, to which the bel] N is secured. Lugs U U, depending from the said angleplate, afford bearing for a shaft, V, provided within disk, W, Afor turnings't, and having attached to and .wound upon it a fine cord,'X

connected with a spiral spring, Y, attached to the bary G, and regulated in-tension according i to the strength of the current operatingy the instrument. One wire, a, leads from the battery b to the insulated shaft A, and the other wire, c, to one of the magnet-coils R, thence ,to the other coil, and then to the frame.L -A

key, d, represents one mode of makingthecircuit, which is normally open.

For the single-stroke actlonof the instru-v,l

ment the cani or eccentric B and the contact' spring M are cut out of circuit. This is done by .any well-known means, such as an arm, a, located on the shaft A and engaged to cut out the cam and spring, with a conducting-stop, s, located on the frame of the instrument.

To convert the instrument forvibratory action, the shaft A is turned toengage the eccen.-

tric with the contact-spring. Then when the4 circuit isv closed by the operator at d, or at a pointcorresponding thereto, the current'will pass through the insulated shaft, thence to the eccentric, thence to the contact-spring, thebar carrying the same, the arbor, the frame, theV magnet-coils, and the battery, thus completing the circuit. The magnet, being energized, attracts the armature, which is drawn to it, breaking the connection between the eccen-` tric and contact-spring, and hence the circuit through the magnet,'which, being then de-- magnetized, releases the armature, which is at' once lifted by the spiral spring and the circuiti 1 y closed again by the contact of the eccentric and spring. The armature is again attracted and the circuit' broken to be made again 'by its consequent release. A rapid making and, breaking of the circuit` intheinstrument is thus secured and maintained'so long as the cir' cuit is kept closed by the operator, and theV bell-hammer, being connected with the armature, partakes of its movements :and strikes f rapid blows upon the bell.

v To convert the armature for single-stroker action, the spring and cam are cut out of` cirico cuit by turning the shaft toengage the arm a6 with the stop s6 on the frame, the cam being at the same time disengaged from the contactspring. Then when the operator closes the circuit, as at d, the current passes through said arm, stop, and the frame, thence through the magnetcoils and to the battery, attracting the armature and effecting a single stroke upon the bell. The circuit being broken at the key, the spiral spring lifts the armature; but the eccentric being cut out of circuit and turned so as to clear the contactspring, the lifting of the armature leaves the circuit still open, so that only one stroke is secured for each manual closing of the circuit. It will thus be seen that when the instrument is converted for vibratory action the circuit is automatically made and broken with great rapidity, and that when converted for single-stroke action the circuit is controlled entirely by 'the operator, who momentarily closes the circuit which is broken in the apparatus, and so remains until closed again outside of it or by the operator.

I Would have it understood that I do not limit myself to the exact construction and com bination of parts herein shown and described, but hold myself at liberty to makesuch changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure 4by Letters Patent, is-

1. In an electric bell, the combination, with a magnet, of au armature therefor, a hammer connected with and actuated thereby, an adjustable stop in the path of a part moved by the armature, an electric conducting-circuit from said magnet passing through said stop and part and adapted to be made or broken by the movement of the latter, a short circuit adapted to cut out said stop and part,and a switch connected with the stop and operated by the latters adjustment to complete the short circuit, substantially as set'forth.

2. In an electric bell, the combination, with a magnet, of an armature, a bell-hammer controlled by the latter, a contactspring carried by the armature, and a cam arranged to be set for contact with such spring to escape the same and to be cut in and out of the circuit of the instrument, substantially as set forth.

3. .In an electric bell, the combination, with a magnet, of an armature, a bell-hammer controlled by the latter, a contact-spring carried by the armature, an insulated rotary shaft, and a cam located upon such shaft, which is turned to engage the cam with the said spring and to disengage it therefrom, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

FRANK B.V Woon.

Witnesses:

J. GILLET N ovas, 1 JAMES F. DoYLE. 

